grab-account: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/grab-account - from package: chiark-scripts

You may install the required package with command apt-get install {package}

Error in other languages:
grab-account: bevel nie gevind nie
grab-account: comandă negăsită
grab-account: comando não encontrado
grab-account: commande introuvable
grab-account: command not found
grab-account: käsku ei ole
grab-account: không tìm thấy lệnh
grab-account: komanda nerasta
grab-account: Kommando nicht gefunden.
grab-account: kommandot finns inte
grab-account: komut yok
grab-account: nie znaleziono polecenia
grab-account: níor aimsíodh an t-ordú
grab-account: no se encontró la orden
grab-account: no s'ha trobat l'ordre
grab-account: opdracht niet gevonden
grab-account: parancs nem található
grab-account: perintah tidak ditemukan
grab-account: príkaz nenájdený
grab-account: příkaz nenalezen
grab-account: команда не найдена
grab-account: командата не е открита
grab-account: 命令找不到
grab-account: コマンドが見つかりません